I am currently wearing one of those belts right now, have been for the last week or so. I was having major issues with water retention and thought this might help, especially with the belly bloating. To be honest I really have not seen much of a difference, but I don't tend to sweat that much anyway, never have. I do notice I sweat a little bit more around my middle with it on. My main reason I have ben wearing it is for back support as weird as that sounds, plus mine has an ice pack compartment which I love and only cost $9 so can't complain. I have been doing physical therapy and have had my back realigned but they all kept slipping back the moment I got home and started lifting my baby and things. They tried taping me up which did nothing, I have a lower back brace but is so constricting when I sit down it was useless unless I remained standing all day which ended up hurting more things then it was helping. The belly trimmer has just a little support to it that it keeps my bones where they need to be, helps my posture but does not cut off the circulation to my legs when I sit down so I can wear it all day. I would do not think it would be able to keep fat off any area but possibly give an illusion of a trimmer belly over a long period mainly for the better posture.